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Beam dynamics studies of the photo-injector in low-charge operation mode for the ERL test facility at IHEP

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Chinese Physics C 2014年第6期38卷 86-92页

作者：焦毅肖欧正 Institute of High Energy Physics Chinese Academy of Sciences

The energy recovery linac test facility （ERL-TF）, which is a compact ERL-FEL （free electron laser） two-purpose machine, was proposed at the Institute of High Energy Physics, Beijing. As one important component of the ERL-TF, the photo-injector that started with a photocathode direct-current gun has been designed. In this paper, optimization of the injector Beam dynamics in low-charge operation mode is performed with iterative scans using Impact-T. In addition, the dependencies between the optimized beam quality and the initial offset at cathode and element parameters are, investigated. The tolerance of alignment and rotation errors is also analyzed.

关键词： ERL photo-injector Beam dynamics

Evolutionary genetic optimization of the injector Beam dynamics for the ERL test facility at IHEP

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Chinese Physics C 2014年第8期38卷 97-102页

作者：焦毅 Institute of High Energy Physics CAS

The energy recovery linac test facility （ERL-TF）, a compact ERL-FEL （free electron laser） two-purpose machine, has been proposed at the Institute of High Energy Physics, Beijing. As one important component of the ERL-TF, the photo-injector was designed and preliminarily optimized. In this paper an evolutionary genetic method, non-dominated sorting genetic algorithm II, is applied to optimize the injector Beam dynamics, especially in the high-charge operation mode. Study shows that using an incident laser with rms transverse size of 1-1.2 ram, the normalized emittance of the electron beam can be kept below 1 mm.mrad at the end of the injector. This work, together with the previous optimization of the low-charge operation mode by using the iterative scan method, provides guidance and confidence for future construction and commissioning of the ERL-TF injector.

关键词： ERL photo-injector Beam dynamics non-dominated sorting genetic algorithm Ⅱ

Beam dynamics design for uranium drift tube linear accelerator

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Chinese Physics C 2014年第7期38卷 97-101页

作者：窦为平何源陆元荣 Institute of Modern Physics China Academy of Sciences University of Chinese Academy of Sciences State Key Lab of Nuclear Physics and Technology Peking University

KONUS Beam dynamics design of uranium whose current is 5.0 emA, is accelerated from injection DTL with LORASR code is presented. The 238U34＋ beam, energy of 0.35 MeV/u to output energy of 1.30 MeV/u by IH-DTL operated at 81.25 MHz in HIAF project at IMP of CAS. It achieves a transmission efficiency of 94.95% with a cavity length of 267.8 cm. The optimization aims are the reduction of emittance growth, beam loss and project costs. Because of the requirements of CW mode operation, the designed average acceleration gradient is about 2.48 MV/m. The maximum axial field is 10.2 MV/m, meanwhile the Kilpatrick breakdown field is 10.56 MV/m at 81.25 MHz.

关键词： drift tube linear accelerator Beam dynamics high gradient continuous wave

Beam dynamics studies on the 100 MeV/100 kW electron linear accelerator for NSC KIPT neutron source

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Chinese Physics C 2012年第7期36卷 653-660页

作者：裴士伦池云龙王书鸿裴国玺周祖圣侯汨 Mykola Ayzatskiy Ivan Karnaukhov Volodymyr Kushnir Viktor Mytrochenko Andrey Zelinsky Institute of High Energy Physics Chinese Academy of Sciences Kharkov Institute of Physics and Technology National Science Center

We designed a 100 MeV/100 kW electron linear accelerator for NSC KIPT, which will be used to drive a neutron source on the basis of subcritical assembly. Beam dynamics studies have been conducted to reach the design requirements （E=100 MeV, P=100 kW, dE/E 〈1% for 99% particles）. In this paper, we will present the progress of the design and the dynamic simulation results. For high intensity and long beam pulse linear accelerators, the BBU effect is one big issue; special care has been taken in the accelerating structure design. To satisfy the energy spread requirement at the linac exit, the particles with large energy difference from the synchronous particle should be eliminated at a low energy stage to ease the design of the collimation system and radiation shielding. A dispersion free chicane with 4 bending magnets is introduced downstream of the 1st accelerating section; the unwanted particles will be collimated there.

关键词： Beam dynamics linear accelerator BBU collimation system neutron source

DTL cavity design and Beam dynamics for a TAC linear proton accelerator

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Chinese Physics C 2012年第2期36卷 167-172页

作者： A. Caliskan M. Yilmaz Gazi University Arts and Sciences Faculty

A 30 mA drift tube linac （DTL） accelerator has been designed using SUPERFISH code in the energy range of 3-55 MeV in the framework of the Turkish Accelerator Center （TAC） project. Optimization criteria in cavity design are effective shunt impedance （ZTT）, transit-time factor and electrical breakdown limit. In geometrical optimization we have aimed to increase the energy gain in each RF gap of the DTL cells by maximizing the effective shunt impedance （ZTT） and the transit-time factor. Beam dynamics studies of the DTL accelerator have been performed using Beam dynamics simulation codes of PATH and PARMILA. The results of both codes have been compared. In the beam dynamical studies, the rms values of beam emittance have been taken into account and a low emittance growth in both x and y directions has been attempted.

关键词： proton accelerator cavity design Beam dynamics

Beam dynamics studies on BEPC-Ⅱ storage rings at the commissioning stage

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Chinese Physics C 2009年第S2期33卷 65-70页

作者：秦庆黄楠刘渭滨刘瑜冬彭月梅邱静王逗王昕昊王娜王九庆魏源源温雪梅邢军徐刚于程辉张闯张源赵政周德民 Institute of High Energy Physics Chinese Academy of Sciences

During the 1st and 2nd stages of the commissioning of the upgrade project of the Beijing Electron Positron Collider (BEPCⅡ), which started on Nov. 12, 2006 and Oct. 24, 2007, respectively, we got the luminosity one tenth of its design value, provided beams to synchrotron radiation users for about 4 months, and studied Beam dynamics as well. In this paper, some Beam dynamics studies on the storage rings and their preliminary results are given.

关键词： BEPCⅡ commissioning Beam dynamics luminosity

Beam dynamics and RF design of trapezoidal IH-RFQ with low energy spread

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Chinese Physics C 2009年第S2期33卷 105-108页

作者：聂元存陆元荣陈佳洱颜学庆郭之虞朱昆方家训 State Key Lab of Nuclear Physics and Technology Peking University

Beam dynamics and RF design have been performed of a new type trapezoidal IH-RFQ operating at 104 MHz for acceleration of 14C+ in the framework of RFQ based 14C AMS facility at Peking University. Low energy spread RFQ Beam dynamics design was approached by the method of internal discrete bunching. 14C+ will be accelerated from 40 keV to 500 keV with the length of about 1.1 m. The designed transmission efficiency is better than 95% and the energy spread is as low as 0.6%. Combining the Beam dynamics design, a trapezoidal IH-RFQ structure was proposed, which can be cooled more easily and has better mechanical performance than traditional RFQ. Electromagnetic field distribution was simulated by using CST Microwave Studio (MWS). The specific shunt impedance and the quality factor were optimized primarily.

关键词： low energy spread Beam dynamics RF design trapezoidal IH-RFQ

High performance computation on Beam dynamics problems in high intensity compact cyclotrons

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High performance computation on beam dynamics problems in hi...

GOAT:a simulation code for high-intensity beams

第一届中国粒子加速器会议

作者： YANG JianJun ZHANG TianJue LIN YuZheng ADELMANN Andreas WANG Feng AN ShiZhong China Institute of Atomic Energy Department of Engineering Physics Tsinghua University Paul Scherrer Institut

This paper presents the research progress in the Beam dynamics problems for future high intensity compact cyclotrons by utilizing the state-of-the-art high performance computation technology.A "Start-to-Stop" model,which includes both the interaction of the internal particles of a single bunch and the mutual interaction of neighboring multiple bunches in the radial direction, is established for compact cyclotrons with multi-turn extraction.This model is then implemented in OPAL-CYCL,which is a 3D object-oriented parallel code for large scale particle simulations in cyclotrons.In addition,to meet the running requirement of parallel computation,we have constructed a small scale HPC cluster system and tested its performance.Finally,the high intensity Beam dynamics problems in the 100 MeV compact cyclotron,which is being constructed at CIAE,are studied using this code and some conclusions are drawn.

关键词： compact cyclotron space charge effects parallel computation Beam dynamics cluster system

来源： cnki会议评论

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Nuclear Science and Techniques 2023年第5期34卷 163-182页

作者： Lei Wang Jian-Cheng Yang Ming-Xuan Chang Fu Ma Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A simulation code,GOAT,is developed to simulate single-bunch intensity-dependent effects and their interplay in the proton ring of the Electron-Ion Collider in China(EicC)project.GOAT is a scalable and portable macroparticle tracking code written in Python and coded by object-oriented programming technology.It allows for transverse and longitudinal tracking,including impedance,space charge effect,electron cloud effect,and beam-beam interaction.In this paper,physical models and numerical approaches for the four types of high-intensity effects,together with the benchmark results obtained through other simulation codes or theories,are presented and discussed.In addition,a numerical application of the cross-talk simulation between the beam-beam interaction and transverse impedance is shown,and a dipole instability is observed below the respective instability threshold.Different mitigation measures implemented in the code are used to suppress the instability.The flexibility,completeness,and advancement demonstrate that GOAT is a powerful tool for Beam dynamics studies in the EicC project or other high-intensity accelerators.

关键词： Code development Numerical methods Beam dynamics High-intensity effects